GCC/Make Build Time Optimizations

Question

We have project which uses gcc and make files. Project also contains of one big subproject (SDK) and a lot of relatively small subprojects which use that SDK and some shared fra

Answer 1

From the description of the project I guess that you have one Makefile per directory and are using recursive make a lot. In that case techniques from "Recursive Make Considered Harmful" should help very much.